Leases - Schedule of Future Principal Minimum Lease Payments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating Leases
2022	$ 1,204
2023	925
2024	627
2025	431
2026	391
And subsequent	446
Total undiscounted lease payments	4,024
Less interest	(540)
Total liabilities	3,484
Less current maturities	(998)	$ (1,167)
Non-current lease liabilities	2,486	2,901
Capital Leases
2022	898
2023	925
2024	952
2025	981
2026	1,010
And subsequent	1,665
Total undiscounted lease payments	6,431
Less interest	(2,120)
Total liabilities	4,311
Less current maturities	(380)	(344)
Non-current lease liabilities	$ 3,931	$ 4,221